Sharpening device for grinding-plates.



No. 694,056. Patented Feb. 25, I902.

R. H. F008 & W. E. CUPENHAVER. SHARPENING DEVICE FOR GRINDING PLATES.

A lieecien filed Nov. 6, 1901.)

(No Model.) 2 Sheets$heet l.

WITNESSES PatentedJ-db. 25, I902. n. H F008 8. w. E. COPENHAVER. 1SIIABPENING DEVICE FOR GRINDING PLATES (Application filed Nov. 8, 1901.)

2 Sheets-Shaet 2;

(No Model.)

WITNESSES I TTQRNE Y.

V UNITED STATES PATENT OFFICE.

ROBER'IHH. FOOS AND WILLIAM E. OOPENI'IAVER, OF SPRINGFIELD, OHIO,ASSIGNOBS TO THE FOOS MANUFACTURING COMPANY, OF SPRINGFIELD, OHIO, ACORPORATION OF OHIO.

SHARPENING DEVICE] FOR GRINDING-PLATES.

SPECIFICATION forming part of Letters Patent No. 694,056, dated February25, 1902. Application filed November 6, 1901. Serial No- 81 .282. (Nomodel.)

To a whom, it may concern: which may be crossed, Each disk or head is Beit known that we, ROBERT H. F008 and faced with grinding-plates 5,having ribs 6, WILLIAM E. COPENHAVER, citizens of the and means areprovided for varying the dis- United States, residing at Springfield, inthe tauce between the disks and for holding them county of Clark andState of Ohio, have inin their normal position with a yielding pres- 55vented certain new and useful Improvements sure-as, for instance, bysprings 7. In mills in Sharpening Devices for Grinding-Plates, of thistype the ribs 6 are constructed with of which the following is aspecification, refsharp corners, which in the courseof time erence beinghad therein tothe accompanybecome worn down or rounded from use,

:0 ing drawings. thereby impairing the efficiency of the grind- 60 Thisinvention relates to sharpening deing-plates. It is the object of ourinvention vices for'grinding-plates, being devised more to restore theefficiency of these plates by particularly for the purpose of sharpeningthe grinding down the outer faces of the ribs in grinding-plates of thatclass of mills known a plane parallel with the base of the plate,

as attrition-mills, in which the grinding is or, in other words, withthe plane of revolu- 65 effected by means of two opposite disks or tionof the head, so that the sharpness of the heads rotating in oppositedirections and proangles of the ribs is restored. To these ends vided ontheir working faces with grindingwe employ a block or plate 8 ofabrasive maplates not in contact with each other, but proterial of athickness such as to adapt it to be vided with ribs whereby the materialas it inserted between thetwo disks orheads of 70 is fed between theplates is reduced by attrithe mill, in which position its opposite facestion. will be in contact with the ribs of the grind It is the object ofour present invention to 'ingplates on both of said disks or heads.provide a simple and efficient mechanism" This block is supported on andcarried by a whereby the ribs of these grinding-plates reciprocating bar9, which forms a carrier 75 when worn may be ground or sharpened in afor said block. The block is connected with rapid and accurate manner,restoring thethe bar inany suitablemanner, and in the grinding-plates toa proper working condition present instance we have shown for this pur-With a slight expenditure of time and labor. pose a clip or stirrup 10,which embraces To this end the invention consists in certhe top and endsof the block 8 and which is 80 tain novel features, which we will nowproconnected to the top of the bar 9 by screwceed to describe and willthen particularly bolts 11. The opening in the stirrup for point out inthe claims. one of these screw-bolts is slotted or out In theaccompanying drawings, Figure 1 is out to the edge of the stirrup, asindicated a perspective view of an attrition-mill of a at 12, thisfeature being shown more par- 85 wellknown type having our improvementticularly in Fig. 3, and by reason of this applied thereto. Fig. 2 is avertical sectional construction it is sufficient to loosen the view ofthe same, taken between the grindscrew-bolts slightly, when that end ofthe ing heads or disks, the sharpening device bestirrup which is slottedmaybe swung later- 40 ing shown in elevation. Fig. 3isa plan view ally,the stirrup turning around the other 90 of the grinding-disks andsharpening device; screw-bolt as a pivot, and thus permitting and Fig. 4is a detail plan view, on an enthe block 8 to be readily removed andrelarged scale, of a portion of the apparatus. placed. The bar orcarrier 9-is supported on In the said drawings we have shown our abracket or yoke 13, which extends between improvement applied to awell-known type of the disks and which is provided with suit- 9 5attrition-mill having disks or heads 1 revolvable guides 14, whichsupport and guide the t ing opposite each other in parallel planes andbar or carrier 9 laterally. These guides are mounted on shafts 2, whichare driven in Oppreferably located outside of the space bepositedirections by any suitable means-as, tween the disks or heads, as shown.The

for instance, pulleys 3 and belts 4:, one of bracket 13 is detachablyconnected to the rob casing 15 of the mill in any suitable manner. Weprefer, however, the particular mode of supporting the bracket which isshown in the accompanying drawings. Mills of this class are providedwith a casing, which is divided horizontally at about mid-height of thedisks or heads, the upper section or cap being removable to give accessto the disks and being removed, as shown in the accompanying drawings,during the operation of sharpening the grinding-plates. This cap isconnected to the lower portion of the casing by means of apertured lugs16, and the bracket is preferably supported on the casing by means ofpins 17 passing through said apertured lugs and through suitableapertures in the bracket, as shown. This construction enables us toreadily apply the entire device to the mill and as readily remove it,while at the same time no additional structural elements are required tobe provided on the mill itself to permit the attachment of thesharpening mechanism, and said mechanism may be applied to mills alreadyconstructed without requiring any alterations therein or additionsthereto.

In order to impart a reciprocating motion to the block 8, we employ alever-18, which is pivotally connected at 19 to one end of the bar orcarrier 9, said lever being also pivotally connected at its lower end toa link 20, which is in turn pivoted tension 21 of the bracket 13.

It will be understood, of course, that the bracket 13, or at least thatportion thereof which lies between the disks or heads, is of less widththan the block 8, and the same is true of the bar or carrier 9 and theclip or stirrup 10.

In sharpening the grinding-plates the cap or upper casing of the mill isremoved and the sharpening apparatus is applied thereto in the manneralready described, the disks or heads being in a position such that theybear upon opposite sides of the grinding-block. The mill is thenstarted, the disks rotating in opposite directions, with the ribs oftheir grinding-plates in contact with the opposite sides of thegrinding-block, and this latter is reciprocated across the faces of thedisks during this operation. The result is that the ribs of the platesare quickly and accurately ground or sharpened in such a manner as torestore the sharp corners thereof, and thus render them once moreefficient. This grinding action takes place in such a manner that thefaces of the ribs of each head are ground in the same plane, that planebeing the plane of revolution of the head. The sharpening attachment maybe readily removed after the operation of sharpening is completed, andthe whole operation is performed Without removing the heads and alsowithout removing the plates from the heads. It will be understood,

of course, that Wherethe mill is of such a character that the springsoperate to hold the grinding-block between the heads such springto adownward ex-.

pressure materially facilitates the sharpening operations.

In practice We prefer to allow the grindlngblock to move freelylaterally with respect to the bar on which it is mounted, since thecontact of the heads with the faces of the block will prevent the latterfrom falling out of place, and this freedom of movement will permit itto properly adjust itself to the planes of rotation of the heads. Millsof this type are usually so constructed that the disks not only run inopposite directions, but at different speeds, and where this is the caseWe so arrange the apparatus that the grinding-block comes into contactwith the face of the more rapidly rotating disk at that part of itssurface which is moving downward or toward the bar 9, so that noexcessive strainis brought upon the stirrup 10, and the excess of thrustis carried by the bar 9 and bracket 13.

We do not wish to be understood as limiting ourselves to the precisedetails of construction hereinbefore described, and shown in theaccompanying drawings, as these details may obviously be modifiedwithout departing from the principle of our invention.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-

1. A sharpening attachment for attritionmills, com prisinga bracket, acarrier mounted to slide thereon, and an abrasive block or plate mountedon the carrier, the opposite sides of said block constituting workingfaces, substantially as described.

2. A sharpening attachment for attritionmills, com prisinga bracket, acarrier mounted to slide thereon, and an abrasive block supported onsaid carrier so as to be free to move laterally, the opposite sides ofsaid block constituting working faces, substantially as described.

8. A sharpening attachment for attritionmills, comprising a bracket,adapted for at tachment to the mill frame or casing and to extendbetween the heads of the mill, a carrier mounted to slide on saidbracket, means connected with said bracket for operating the carrier,and an abrasive block or plate of greater width than the carrier andbracket and mounted on the carrier, its opposite sides constitutingworking faces, substantially as described.

4. A sharpening attachment for attritionmills, comprising a bracket,adapted for connection to the opposite sides of the mill frame orcasing, the body of said bracket adapted to pass between the heads ofthe mill and provided with guides, a bar or carrier mounted to slide onsaid bracket and laterally supported by the guides, an abrasive blockmounted on said carrier and having a width or thickness greater thanthat of the carrier and bracket, its opposite sides constituting workingsurfaces, and an operating-lever connected with the bracket and with thebar or carrier, substantially as described. 1

5. The combination, with the heads or disks of an attrition-mill, andmeans for rotating the same in opposite directions, of a bracketextending between the same, a carrier slidably mounted on said bracket,and an abrasive block mounted on said carrier and having its oppositesides in contact with the grinding-surfaces of both heads, substantiallyas described.

6. The combination, with the heads ordisks of an attrition-mill, andmeans for rotating the same in opposite directions, of a bracketextending between the same, a carrier slid ably mounted on said bracket,and an abrasive block mounted on said carrier and hav:

ing its opposite sides in contact with the'grind-.

block with a yielding pressure, substantially v as described.

8. The combination, with 'the opposite heads of an attrition-mill, meansfor rotating said heads in opposite directions, one of said heads beingmovable toward and from the other and provided with a spring foryieldingly holding it in position, of a bracket ex-- tending between theheads, a carrier slidably mounted on said bracket, and a grindingblockof greater thickness or width than the bracket and carrier and supportedon the .carrier so as to be free to yield laterally thereof, itsopposite sides constituting work-- ing faces cont-acting'with thegrinding-surfaces of the respective heads, substantially as described.

9. The combination, with an attrition-mill having opposite heads, meansfor. rotating said heads in opposite directions, and a divided casingprovided with lugs which serve v to attach the removable upper portionof the casing, of a sharpening attachment comprising a bracket adaptedto be fitted and secured to said lugs and provided with a carrierslidably mounted thereon, and an abrasive block mounted on the carrierand hav-' ing its opposite sides constituting working surfaces,substantially as described.

In testimony whereof we affix our signa cures in presence of twowitnesses.

ROBERT HfFOOS. WILLIAM E. GOPENHAVER.

Witnesses:

CLARENCE M. IIOLLENBECH, VICTOR Y. SMITH.

